Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Reexamination Certificate
2008-05-28
2009-11-17
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
C330S251000
Reexamination Certificate
active
07619480
ABSTRACT:
An improved Class G type amplifier is provided which switches between multiple power rails depending upon the instantaneous amplitude of the input signal versus the power rails without excessive distortion. The low voltage (inner) amplifier includes a plurality of parallel amplifier devices, and the high voltage (outer) amplifier includes a plurality of parallel amplifier devices. A plurality of switches each couples the input signal to either a respective one of the inner amplifier devices or a respective one of the outer amplifier devices. The switches are activated sequentially, such that the switching from inner amplifier devices to outer amplifier devices or vice versa is staggered over time. This avoids having a single, large glitch in the output and spreads multiple smaller glitches over enough time so that some of the radiated glitch energy can fall within frequencies where amplifier feedback circuitry can eliminate its noise. The switches are sequentially activated by a series of delay elements.
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Fairchild Semiconductor Corporation
Nguyen Hieu P
Pascal Robert
Schwegman Lundberg & Woessner, P.A.
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